Not only that, but if you set it to run on startup, it will pop in front of all the rest of the windows and show not something neutral like the team list, but your last chat.
So if you teach with a laptop, its awfully sluggish startup is timed just right so that you have enough time to turn on the laptop, turn on the projector, open the presentation, connect the HDMI cable, wait for the presentation to show up and check that it works, start talking, and just then... BAM, there goes your last private chat in front of all the students.
Of course, it can be fixed by just not setting it to autostart - but why should I have to do that? Why is that program so chock full of obviously bad design decisions?